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    <title>Document</title>

    <style>
        ul.a {
            list-style-type: circle;
        }

        ul.b {
            list-style-type: square;
        }

        ol.c {
            list-style-type: upper-roman;
        }

        ol.d {
            list-style-type: decimal;  
            list-style-image: url("../image/icon.png");
            list-style-position: outside;
        }
    </style>
</head>
<body>
    <p>无序列表实例</p>
    <ul class="a">
        <li>aa</li>
        <li>bb</li>
        <li>cc</li>
    </ul>

    <ul class="b">
        <li>aa</li>
        <li>bb</li>
        <li>cc</li>
    </ul>

    <p>有序列表实例</p>
    <ol class="c">
        <li>11</li>
        <li>22</li>
        <li>33</li>
    </ol>

    <ol class="d">
        <li>linfangyi</li>
        <li>fanshuai</li>
        <li>douyin</li>
    </ol>
</body>
</html>